/*
 * File      : cpu.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2010, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-05-17     swkyer       first version
 */
#ifndef __EXCEPTION_H__
#define __EXCEPTION_H__


/*
 * important register numbers
 */
#define REG_EPC             37
#define REG_FP              72
#define REG_SP              29

/*
 * Stack layout for the GDB exception handler
 * Derived from the stack layout described in asm-mips/stackframe.h
 *
 * The first PTRSIZE*6 bytes are argument save space for C subroutines.
 */
#define NUMREGS             90

#define GDB_FR_REG0         (PTRSIZE*6)         /* 0 */
#define GDB_FR_REG1         ((GDB_FR_REG0) + LONGSIZE)  /* 1 */
#define GDB_FR_REG2         ((GDB_FR_REG1) + LONGSIZE)  /* 2 */
#define GDB_FR_REG3         ((GDB_FR_REG2) + LONGSIZE)  /* 3 */
#define GDB_FR_REG4         ((GDB_FR_REG3) + LONGSIZE)  /* 4 */
#define GDB_FR_REG5         ((GDB_FR_REG4) + LONGSIZE)  /* 5 */
#define GDB_FR_REG6         ((GDB_FR_REG5) + LONGSIZE)  /* 6 */
#define GDB_FR_REG7         ((GDB_FR_REG6) + LONGSIZE)  /* 7 */
#define GDB_FR_REG8         ((GDB_FR_REG7) + LONGSIZE)  /* 8 */
#define GDB_FR_REG9         ((GDB_FR_REG8) + LONGSIZE)  /* 9 */
#define GDB_FR_REG10        ((GDB_FR_REG9) + LONGSIZE)  /* 10 */
#define GDB_FR_REG11        ((GDB_FR_REG10) + LONGSIZE) /* 11 */
#define GDB_FR_REG12        ((GDB_FR_REG11) + LONGSIZE) /* 12 */
#define GDB_FR_REG13        ((GDB_FR_REG12) + LONGSIZE) /* 13 */
#define GDB_FR_REG14        ((GDB_FR_REG13) + LONGSIZE) /* 14 */
#define GDB_FR_REG15        ((GDB_FR_REG14) + LONGSIZE) /* 15 */
#define GDB_FR_REG16        ((GDB_FR_REG15) + LONGSIZE) /* 16 */
#define GDB_FR_REG17        ((GDB_FR_REG16) + LONGSIZE) /* 17 */
#define GDB_FR_REG18        ((GDB_FR_REG17) + LONGSIZE) /* 18 */
#define GDB_FR_REG19        ((GDB_FR_REG18) + LONGSIZE) /* 19 */
#define GDB_FR_REG20        ((GDB_FR_REG19) + LONGSIZE) /* 20 */
#define GDB_FR_REG21        ((GDB_FR_REG20) + LONGSIZE) /* 21 */
#define GDB_FR_REG22        ((GDB_FR_REG21) + LONGSIZE) /* 22 */
#define GDB_FR_REG23        ((GDB_FR_REG22) + LONGSIZE) /* 23 */
#define GDB_FR_REG24        ((GDB_FR_REG23) + LONGSIZE) /* 24 */
#define GDB_FR_REG25        ((GDB_FR_REG24) + LONGSIZE) /* 25 */
#define GDB_FR_REG26        ((GDB_FR_REG25) + LONGSIZE) /* 26 */
#define GDB_FR_REG27        ((GDB_FR_REG26) + LONGSIZE) /* 27 */
#define GDB_FR_REG28        ((GDB_FR_REG27) + LONGSIZE) /* 28 */
#define GDB_FR_REG29        ((GDB_FR_REG28) + LONGSIZE) /* 29 */
#define GDB_FR_REG30        ((GDB_FR_REG29) + LONGSIZE) /* 30 */
#define GDB_FR_REG31        ((GDB_FR_REG30) + LONGSIZE) /* 31 */

/*
 * Saved special registers
 */
#define GDB_FR_STATUS       ((GDB_FR_REG31) + LONGSIZE) /* 32 */
#define GDB_FR_LO           ((GDB_FR_STATUS) + LONGSIZE)    /* 33 */
#define GDB_FR_HI           ((GDB_FR_LO) + LONGSIZE)    /* 34 */
#define GDB_FR_BADVADDR     ((GDB_FR_HI) + LONGSIZE)    /* 35 */
#define GDB_FR_CAUSE        ((GDB_FR_BADVADDR) + LONGSIZE)  /* 36 */
#define GDB_FR_EPC          ((GDB_FR_CAUSE) + LONGSIZE) /* 37 */

///*
// * Saved floating point registers
// */
//#define GDB_FR_FPR0       ((GDB_FR_EPC) + LONGSIZE)   /* 38 */
//#define GDB_FR_FPR1       ((GDB_FR_FPR0) + LONGSIZE)  /* 39 */
//#define GDB_FR_FPR2       ((GDB_FR_FPR1) + LONGSIZE)  /* 40 */
//#define GDB_FR_FPR3       ((GDB_FR_FPR2) + LONGSIZE)  /* 41 */
//#define GDB_FR_FPR4       ((GDB_FR_FPR3) + LONGSIZE)  /* 42 */
//#define GDB_FR_FPR5       ((GDB_FR_FPR4) + LONGSIZE)  /* 43 */
//#define GDB_FR_FPR6       ((GDB_FR_FPR5) + LONGSIZE)  /* 44 */
//#define GDB_FR_FPR7       ((GDB_FR_FPR6) + LONGSIZE)  /* 45 */
//#define GDB_FR_FPR8       ((GDB_FR_FPR7) + LONGSIZE)  /* 46 */
//#define GDB_FR_FPR9       ((GDB_FR_FPR8) + LONGSIZE)  /* 47 */
//#define GDB_FR_FPR10      ((GDB_FR_FPR9) + LONGSIZE)  /* 48 */
//#define GDB_FR_FPR11      ((GDB_FR_FPR10) + LONGSIZE) /* 49 */
//#define GDB_FR_FPR12      ((GDB_FR_FPR11) + LONGSIZE) /* 50 */
//#define GDB_FR_FPR13      ((GDB_FR_FPR12) + LONGSIZE) /* 51 */
//#define GDB_FR_FPR14      ((GDB_FR_FPR13) + LONGSIZE) /* 52 */
//#define GDB_FR_FPR15      ((GDB_FR_FPR14) + LONGSIZE) /* 53 */
//#define GDB_FR_FPR16      ((GDB_FR_FPR15) + LONGSIZE) /* 54 */
//#define GDB_FR_FPR17      ((GDB_FR_FPR16) + LONGSIZE) /* 55 */
//#define GDB_FR_FPR18      ((GDB_FR_FPR17) + LONGSIZE) /* 56 */
//#define GDB_FR_FPR19      ((GDB_FR_FPR18) + LONGSIZE) /* 57 */
//#define GDB_FR_FPR20      ((GDB_FR_FPR19) + LONGSIZE) /* 58 */
//#define GDB_FR_FPR21      ((GDB_FR_FPR20) + LONGSIZE) /* 59 */
//#define GDB_FR_FPR22      ((GDB_FR_FPR21) + LONGSIZE) /* 60 */
//#define GDB_FR_FPR23      ((GDB_FR_FPR22) + LONGSIZE) /* 61 */
//#define GDB_FR_FPR24      ((GDB_FR_FPR23) + LONGSIZE) /* 62 */
//#define GDB_FR_FPR25      ((GDB_FR_FPR24) + LONGSIZE) /* 63 */
//#define GDB_FR_FPR26      ((GDB_FR_FPR25) + LONGSIZE) /* 64 */
//#define GDB_FR_FPR27      ((GDB_FR_FPR26) + LONGSIZE) /* 65 */
//#define GDB_FR_FPR28      ((GDB_FR_FPR27) + LONGSIZE) /* 66 */
//#define GDB_FR_FPR29      ((GDB_FR_FPR28) + LONGSIZE) /* 67 */
//#define GDB_FR_FPR30      ((GDB_FR_FPR29) + LONGSIZE) /* 68 */
//#define GDB_FR_FPR31      ((GDB_FR_FPR30) + LONGSIZE) /* 69 */
//
//#define GDB_FR_FSR        ((GDB_FR_FPR31) + LONGSIZE) /* 70 */
//#define GDB_FR_FIR        ((GDB_FR_FSR) + LONGSIZE)   /* 71 */
//#define GDB_FR_FRP        ((GDB_FR_FIR) + LONGSIZE)   /* 72 */
//
//#define GDB_FR_DUMMY      ((GDB_FR_FRP) + LONGSIZE)   /* 73, unused ??? */
//
///*
// * Again, CP0 registers
// */
//#define GDB_FR_CP0_INDEX  ((GDB_FR_DUMMY) + LONGSIZE) /* 74 */
#define GDB_FR_FRP          ((GDB_FR_EPC) + LONGSIZE)   /* 72 */
#define GDB_FR_CP0_INDEX    ((GDB_FR_FRP) + LONGSIZE)   /* 74 */

#define GDB_FR_CP0_RANDOM   ((GDB_FR_CP0_INDEX) + LONGSIZE) /* 75 */
#define GDB_FR_CP0_ENTRYLO0 ((GDB_FR_CP0_RANDOM) + LONGSIZE)/* 76 */
#define GDB_FR_CP0_ENTRYLO1 ((GDB_FR_CP0_ENTRYLO0) + LONGSIZE)/* 77 */
#define GDB_FR_CP0_CONTEXT  ((GDB_FR_CP0_ENTRYLO1) + LONGSIZE)/* 78 */
#define GDB_FR_CP0_PAGEMASK ((GDB_FR_CP0_CONTEXT) + LONGSIZE)/* 79 */
#define GDB_FR_CP0_WIRED    ((GDB_FR_CP0_PAGEMASK) + LONGSIZE)/* 80 */
#define GDB_FR_CP0_REG7     ((GDB_FR_CP0_WIRED) + LONGSIZE) /* 81 */
#define GDB_FR_CP0_REG8     ((GDB_FR_CP0_REG7) + LONGSIZE)  /* 82 */
#define GDB_FR_CP0_REG9     ((GDB_FR_CP0_REG8) + LONGSIZE)  /* 83 */
#define GDB_FR_CP0_ENTRYHI  ((GDB_FR_CP0_REG9) + LONGSIZE)  /* 84 */
#define GDB_FR_CP0_REG11    ((GDB_FR_CP0_ENTRYHI) + LONGSIZE)/* 85 */
#define GDB_FR_CP0_REG12    ((GDB_FR_CP0_REG11) + LONGSIZE) /* 86 */
#define GDB_FR_CP0_REG13    ((GDB_FR_CP0_REG12) + LONGSIZE) /* 87 */
#define GDB_FR_CP0_REG14    ((GDB_FR_CP0_REG13) + LONGSIZE) /* 88 */
#define GDB_FR_CP0_PRID     ((GDB_FR_CP0_REG14) + LONGSIZE) /* 89 */

#define GDB_FR_SIZE         ((((GDB_FR_CP0_PRID) + LONGSIZE) + (PTRSIZE-1)) & ~(PTRSIZE-1))

/*
 * This is the same as above, but for the high-level
 * part of the INT stub.
 */
typedef struct pt_regs_s
{
    /* Saved main processor registers. */
    rt_base_t regs[32];
    /* Saved special registers. */
    rt_base_t cp0_status;
    rt_base_t hi;
    rt_base_t lo;
    rt_base_t cp0_badvaddr;
    rt_base_t cp0_cause;
    rt_base_t cp0_epc;
} pt_regs_t;

typedef void (* exception_func_t)(pt_regs_t *regs);

extern exception_func_t sys_exception_handlers[];
exception_func_t rt_set_except_vector(int n, exception_func_t func);
void install_default_execpt_handle(void);

#endif /* end of __EXCEPTION_H__ */
